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    <title>数据可视化</title>
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    <header>
        <h1>数据可视化</h1>
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            var t = null;
            t = setTimeout(time, 1000); // 开始运行
            function time() {
                clearInterval(t); // 清除定时器
                dt = new Date();
                var y = dt.getFullYear();
                var mt = dt.getMonth() + 1;
                var day = dt.getDate();
                var h = dt.getHours(); // 获取时
                var m = dt.getMinutes(); // 获取分
                var s = dt.getSeconds(); // 获取秒
                document.querySelector(".showTime").innerHTML = '当前时间:    ' + y + "年" + mt + "月" + day + "-" + h +
                    "时" +
                    m + "分" + s + "秒";
                t - setTimeout(time, 1000); // 设定定时器，循环运行
            }
        </script>

    </header>
    <!-- 页面主体部分 -->
    <section class="mainbox">
        <div class="column">
            <div class="panel bar">
                <h2>就业行业 </h2>
                <div class="chart">

                </div>
                <div class="panel-footer"></div>
            </div>

            <div class="panel line">
                <h2>学习变化
                    <a href="javascript:;">2020</a>
                    <a href="javascript:;">2021</a>
                </h2>
                <div class="chart"></div>
                <div class="panel-footer"></div>
            </div>

            <div class="panel pie">
                <h2>程序员年龄段</h2>
                <div class="chart"></div>
                <div class="panel-footer"></div>
            </div>
        </div>
        <div class="column">
            <!-- no模块制作 -->
            <div class="no">
                <div class="no-hd">
                    <ul>
                        <li>113536</li>
                        <li>100563</li>
                    </ul>
                </div>
                <div class="no-bd">
                    <ul>
                        <li>程序员需求人数</li>
                        <li>程序员供应人数</li>
                    </ul>
                </div>
            </div>
            <!-- 地图模块 -->
            <div class="map">
                <div class="map1"> </div>
                <div class="map2"></div>
                <div class="map3"></div>
                <div class="chart"></div>
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        </div>
        <div class="column">
            <div class="panel bar2">
                <h2>就业行业统计</h2>
                <div class="chart"></div>
                <div class="panel-footer"></div>
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            <div class="panel line2">
                <h2>公司人员流动</h2>
                <div class="chart"></div>
                <div class="panel-footer"></div>
            </div>

            <div class="panel pie2">
                <h2>各地程序员占比</h2>
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                <div class="panel-footer"></div>
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